— The question is whether one county prosecutor may bind another county to a use/derivative use immunity agreement without the latter’s knowledge and/or consent. Specifically, we have been asked to hold that an informal immunity agreement entered into by one prosecuting attorney is binding upon a neighboring prosecuting attorney; we decline to do so. We have also been asked to hold one county is estopped from using witness evidence, which had been suppressed as impermissible fruit of a bargained for immunity agreement in another county; we decline to do so. We do hold, however, under the facts of this case, that the doctrine of fundamenta] fairness which attaches to all agreements for which prosecutors barter leniency for waiver of the right against self-incrimination, requires dismissal of certain charges against the Petitioner in this matter. Therefore, we reverse the Court of Appeals decision with instructions to dismiss the charges in question.
FACTS
Between October 1993 and March 1994, a series of robberies were committed along the 1-5 corridor in the counties of Cowlitz, King, and Snohomish. Law enforcement suspected the same persons had committed the crimes: Vincent Bryant, Jeffrey Dorman, and Willie King. However, the police did not have any physical evidence clearly linking any of the suspects to the crimes.
The case at issue involves a Snohomish County home invasion robbery. On the morning of November 5, 1993, three armed men wearing masks and gloves forcibly entered the residence of Steven and Cindy Linari, where they and their adolescent son were bound and robbed. The case was assigned to the Everett Police Department and was closed as unsolved in April or May 1994.
*93Bryant was later arrested on an unrelated charge in King County and offered to provide the King County prosecutor with information about the unsolved robberies that occurred along the 1-5 corridor. Bryant accepted King County’s offer of use/derivative use immunity and in turn offered statements incriminating himself, Dorman, King, and David Israel.1 The immunity agreement was broad in its promises. The text of the immunity agreement provides, in relevant part:
To protect your rights and to encourage you to be completely candid and truthful, we have agreed to grant you use and derivative use immunity for purposes of a debriefing session. Use and derivative use immunity means that nothing you reveal can ever be used against you in any prosecution. Additionally, nothing you reveal can be utilized by law enforcement to find additional evidence to use against you. This promise of use immunity does not extend to self-incrimination with respect to any other possible crimes of violence such as murder, rape, or arson.
If you abide by the terms of this letter you are assured that all the information you provide will be closely held by this office, unless, and until a formal cooperation agreement is reached. Additionally nothing you say during the interview will be used in any way against you, even should no agreement be reached.
My signature below indicates the King County Prosecuting Attorney’s Office’s agreement to the terms of this letter.
Clerk’s Papers (CP) at 71-72.
According to the record, Bryant was interviewed by the King County prosecutor’s office on four separate occasions. No Snohomish County representative was a party to the informal immunity agreement between King County and Bryant, nor did any representative attend the interviews. In fact, Snohomish County contends it was not aware the King County meetings had taken place and the substance of *94Bryant’s testimony was never shared with any Snohomish County representatives. According to Snohomish County, this nonsharing was deliberate, to avoid tainting any possible subsequent Snohomish County prosecution of Bryant with his own immunized statements. Snohomish County understood it was prohibited from obtaining and using Bryant’s immunized statements.
After plea negotiations between Bryant and King County prosecutors broke down, King County prosecutors contacted Dorman. On November 21, 1996, Kang County prosecutors offered Dorman the same use/derivative use immunity agreement previously signed by Bryant, which Dorman executed. Over the course of approximately six months, Dorman gave immunized and incriminating statements, implicating himself, Bryant, King, and Israel.
On December 2, 1996, King County charged Bryant, Dorman, King, and Israel with 41 counts of money laundering, robbery, kidnapping and residential burglary. The Linari home invasion robbery in Snohomish County was included among the charges.
In April 1997, the King County trial court severed Bryant from being tried with his codefendants. Based upon venue objection by Bryant, the King County trial court also dismissed the Snohomish County charges without prejudice.
Five months later, a Snohomish County representative met with and entered into an informal use/derivative use immunity agreement with Dorman by adding Snohomish County to the immunity agreement between Dorman and King County. The Snohomish County prosecutor then refiled the Linari robbery and kidnapping charges against Bryant. The Snohomish County case against Bryant was based almost entirely upon the anticipated testimony of Dorman, who had now been granted immunity by the counties of King and Snohomish.
Bryant moved the trial court to suppress the testimony of Dorman and to dismiss the remaining charges filed in King *95County. Bryant alleged the King County case against him was based upon Dorman’s testimony, which was derived from his own immunized statements and therefore was in violation of his immunity agreement with King County. The King County trial court dismissed all counts against Bryant, except four for which it found an independent evidentiary basis, and specifically declined to address the Linari case pending in Snohomish County.
Bryant then moved to suppress Dorman’s statements in Snohomish County. The Snohomish County trial court determined collateral estoppel applied and suppressed all of Dorman’s statements reasoning, “whether Jeff Dorman’s decision to cooperate with the State in the present case is derived from Vincent Bryant’s immunized cooperation in King County is at issue. This is the same issue that was presented ... in the King County case.” CP at 12. Based upon this finding, Snohomish County conceded it lacked probable cause to proceed without Dorman’s statements which resulted in the dismissal of all charges against Bryant related to the Linari robbery. Id. Snohomish County appealed.
The Court of Appeals reversed the Snohomish County trial court’s dismissal of all charges, determining although the factual issue before the Snohomish County trial court was the same as that in King County,2 the legal issue was different.
ISSUE PRESENTED
This is a case of first impression: does an informal use/derivative use immunity agreement, which purports to grant immunity for incriminating statements that “can [n]ever be used against you in any prosecution,” entered *96into by one state prosecutor bind another state prosecutor from a sister county?
ANALYICAL APPROACHES
While no court has addressed the specific issue before us, agreements between law enforcement officials and the accused have generated a substantial body of precedent. Courts have resorted to a patchwork of statutory, contract, equitable and Fifth Amendment due process analytical approaches to address related issues.
Here, both parties have offered arguments grounded in traditional contract law. While useful by analogy, contract law assumes a fairly bargained for agreement and the remedies are intended to provide the parties with the benefit of their agreement or return them as nearly as practical to their preagreement position; neither the assumption nor remedies squarely fit the reality of criminal prosecutions. State v. Reed, 75 Wn. App. 742, 879 P.2d 1000 (1994). Both parties also argue cases involving plea bargains, but the only remedies available for breach of a plea agreement are specific performance or withdrawal of the plea. Santobello v. New York, 404 U.S. 257, 92 S. Ct. 495, 30 L. Ed. 2d 427 (1971). A violation of an agreement to induce an accused to waive the Fifth Amendment right against self-incrimination, if one is found, may require the crafting of a remedy consistent with the scope of the privilege against self-incrimination. Kastigar v. United States, 406 U.S. 441, 92 S. Ct. 1653, 32 L. Ed. 2d 212 (1972). Thus, while useful, plea bargains differ from grants of informal immunity.
We have been urged to look at the federal system for guidance where the agreement of one federal prosecutor may bind other federal districts.3 Our state system differs from the federal system where all prosecutors must answer *97to the single United States attorney general. We are also referred to cases holding that one state’s attorney general may not bind another state’s attorney general. Louisiana v. Edmondson, 97-2456 (La. 7/8/98), 714 So. 2d 1233. But here we are not dealing with a question of federalism, rather a question of intrajurisdictional authority. Yet, while not dispositive, these many explorations into the issues and principles of our criminal justice system provide us with a framework for analysis.
The type and scope of the immunity agreement is important to any analysis. Immunity agreements may be either formal or informal. Formal immunity is imposed upon an unwilling witness. The government may compel testimony from an unwilling witness who invokes the Fifth Amendment privilege against compulsory self-incrimination, by conferring upon the witness immunity. When first confronted with this issue, the United States Supreme Court held unconstitutional an 1868 statute which required testimony over a refusal to testify on Fifth Amendment grounds because the protection the statute provided a witness was not “coextensive” with that afforded by the Fifth Amendment. Counselman v. Hitchcock, 142 U.S. 547, 12 S. Ct. 195, 35 L. Ed. 1110 (1892). While the ability of the government to compel testimony in exchange for a grant of immunity is now well established, this formal immunity process is cloaked with a high degree of constitutional protection.
Informal immunity is a grant of immunity to a willing witness. Usually an accused or a suspect trades information and testimony to enable the State to make a case against other defendants. These agreements are criticized for many reasons—from being too lenient on the criminal informer, to being an inducement for criminals to testify to anything to save their own necks. An immunity agreement does not require a plea, but is a deal in which the subject may escape *98scot free. Accordingly, these informal consensual immunity arrangements have been provided less constitutional protection.
The scope of an immunity agreement may be tailored, but generally falls into two categories: “transactional immunity” and “use/derivative use immunity.” Transactional immunity precludes prosecution arising from any transaction about which a witness testifies, while use/derivative use immunity acts only to suppress a witness’ testimony and evidence derived directly or indirectly from that testimony. Use/derivative use immunity is favored over transactional immunity by prosecutors because it permits prosecution if the State can show the source of its evidence is wholly independent from and untainted by the fruit of the witness’ testimony. It also places the informer exactly where he or she would have been had there been no agreement.
The King County prosecutor and Bryant entered into a negotiated, informal use/derivative use immunity agreement. It is the application of that agreement we review.
COLLATERAL ESTOPPEL ANALYSIS
The trial court and the Court of Appeals both decided this case on collateral estoppel grounds so we will begin our analysis there.
Collateral estoppel applies in criminal cases to bar relitigation of a particular issue or fact previously determined by a valid and final judgment. State v. Williams, 132 Wn.2d 248, 253-54, 937 P.2d 1052 (1997); State v. Peele, 75 Wn.2d 28, 30, 448 P.2d 923 (1968). “Collateral estoppel promotes judicial economy and prevents inconvenience, and even harassment, of parties.” Reninger v. Dep’t of Corr., 134 Wn.2d 437, 449, 951 P.2d 782 (1998). Washington courts have never barred a criminal prosecution on the grounds of collateral estoppel.
Generally, collateral estoppel requires:
“(1) the issue decided in the prior adjudication must be identical with the one presented in the second; (2) the prior adjudi*99cation must have ended in a final judgment on the merits; (3) the party against whom the plea of collateral estoppel is asserted must have been a party or in privity with a party to the prior litigation; and (4) application of doctrine must not work an injustice.”
Williams, 132 Wn.2d at 254 (quoting State v. Cleveland, 58 Wn. App. 634, 639, 794 P.2d 546 (1990) (quoting Beagles v. Seattle-First Nat’l Bank, 25 Wn. App. 925, 929, 610 P.2d 962 (1980))). Each element of the four-part test must be met, id.
In this case, Snohomish County concedes the prosecuting authorities of sister counties within the same sovereign are in privity for collateral estoppel purposes. Williams, 132 Wn.2d at 256-57; State v. Dupard, 93 Wn.2d 268, 273, 609 P.2d 961 (1980); State v. Sherwood, 71 Wn. App. 481, 488, 860 P.2d 407 (1993). And although the other three elements remain disputed, the question specifically posed to this Court is: whether the issue raised and resolved in the King County prosecution is identical to that which Bryant now seeks to bar in Snohomish County.
The King County trial court determined:
The court finds that on this record, Jeff Dorman, as an evidentiary source, was derived directly from Vincent Bryant’s immunized testimony.
CP at 39-44. Similarly, the Snohomish County trial court made the following finding:
In light of Kastigar v. United States, 406 U.S. 441, 92 S. Ct. 1653, 32 L. Ed. 2d 212 (1972) and its progeny, whether Jeff Dorman’s decision to cooperate with the state in the present case is derived from Vincent Bryant’s immunized cooperation in King County is at issue. This is the same issue that was presented to Judge Mertel in the King County case.
CP at 12. However, for the application of collateral estoppel the factual issues between the King and Snohomish prosecutions are different. The issue in Snohomish County must be: can Snohomish County establish affirmatively that it obtained its evidence independently and wholly independent of the immune source? This is a different issue than *100whether the King County prosecutor has independent evidence. Snohomish County had the right to establish that it had obtained evidence wholly independent of the immune statements. The issues presented in the two hearings are different; therefore collateral estoppel does not apply.
CONTRACT ANALYSIS
Courts have found informal immunity agreements to be subject to contract analysis. United States v. Dudden, 65 F.3d 1461, 1467 (9th Cir. 1995) (informal immunity agreements are interpreted using the ordinary principles of contract); Anthony v. Cambra, 1999 WL 30538, at *4 (N.D. Cal. 1999), aff’d, 236 F.3d 568 (9th Cir. 2000). Generally, the terms of a contract will bind only the parties to the contract. Fisher Flouring Mills Co. v. Swanson, 76 Wash. 649, 668, 137 R 144 (1913). A person cannot be bound by the terms of a contract of which he knew nothing. Sharpe Sign Co. v. Parrish, 33 Wn.2d 883, 894, 207 P.2d 758 (1949). Because grants of informal immunity are contractual in nature, others, not parties to the original agreement, cannot be bound. United States v. Turner, 936 F.2d 221, 223 (6th Cir. 1991).
Washington courts have acknowledged the principles of ordinary contract law may be used by analogy to assess plea bargain agreements. But our courts have declined to transport the panoply of contract law doctrines in toto into criminal law. Reed, 75 Wn. App. at 744. Bargained for cooperation agreements do not fit easily into contract law concepts, which for the most part have evolved from commercial relationships involving the exchange of goods and services for money. Contract remedies often rely upon a payment of money.
The arguments of Snohomish County are persuasive. As the King County trial court found, “[t]he contract language of the immunity agreement is controlling.” CP at 40. The parties to the contract were Bryant and the King County prosecuting attorney’s office. In return for Bryant’s testi*101mony, the King County prosecuting attorney’s office promised use/derivative use immunity, and pledged that the information would be closely held by the office.
Additionally the Snohomish County prosecutor’s office was not mentioned anywhere in the immunity agreement. It also cannot be ignored that Snohomish County was unaware of King County’s two years of ongoing investigation of Bryant and, until October 1996, the immunity agreement between King County and Bryant, as well. It should further be recognized that Snohomish County had not been privy to Bryant’s immunized statements to King County representatives. Snohomish County is not bound by King County’s immunity agreement with Bryant based upon the principles of contract law.
AGENCY ANALYSIS
Bryant contends Snohomish County is bound by the King County immunity agreement pursuant to the law of agency. Courts have applied agency principles to determine the scope and validity of immunity agreements.
Actual Authority
Federal formal immunity binds the “government” at large and not just specific United States “districts.” United States v. Carter, 454 F.2d 426 (4th Cir. 1972). State courts have declined to follow the federal example because federal prosecutors derive their power from a single sovereign whereas state prosecutors are elected by and answerable to their local county or parish constituents. State v. Barnett, 124 Ohio App. 3d 746, 754, 707 N.E.2d 564 (1998). Prosecutors in Washington State are elected and subject to recall by the citizens of the county they serve. Wash. Const, art. I, § 33. Even the Snohomish County Charter provides for a prosecuting attorney to be elected by the voters of the county.4 Thus, when read together, the state constitution, relevant statutes, and the county charter of Snohomish all *102stress accountability of the elected prosecutor to that county’s electorate and put limitations on the county prosecutor’s power appropriate for a county official. See Wash. Const, art. XI.
County prosecutors are invested by the State with a limited grant of power to represent the State of Washington to enforce the laws of the State within each prosecutor’s county. A prosecutor’s authority is, with exceptions not relevant here, limited to the county the prosecutor serves. The State grants the same authority to the prosecutors of neighboring counties. The decision whether to prosecute or not, and the decision whether to enter into a plea bargain agreement or not, is generally within the discretion of each county prosecutor. How that discretion is exercised affects the quality of law enforcement and the administration of justice within each county, and thus it is of vital importance to the separate counties to determine, individually, the character and emphasis of prosecutions.5 We fail to find a grant of actual authority, either by the State or Snohomish County to King County, to enter into immunity agreements that bind Snohomish County.
Apparent Authority
In the alternative, Bryant contends King County had apparent authority to bind Snohomish County to his immunity agreement with King County. Apparent authority exists where words or conduct by the principal are reasonably interpreted by a third party as conferring authority upon the agent. Restatement (Third) of Agency § 2.03 (2000). The essence of Bryant’s argument is that the State has cloaked each county prosecutor within the State with apparent authority to bind the State. The State grants to *103county prosecutors the authority to appear and represent the State in criminal proceedings. RCW 36.27.020. The language in the immunity agreement is broad referring to “any prosecution” and “nothing you reveal can be utilized by law enforcement to find additional evidence to use against you.” On the other hand, there is nothing within the immunity agreement itself which purports to be on behalf of the State, as the agreement expressly provides, “[m]y signature below indicates the King County Prosecuting Attorney’s Office’s agreement to the terms of this letter. FOR NORM MALENG, King County Prosecuting Attorney, BARBARA A. MACK.” CP at 72.
Here, Snohomish County urges us to rely upon two state plea bargain cases: Barnett, 124 Ohio App. 3d 746, and People v. Woods, 169 Ill. App. 3d 126, 119 Ill. Dec. 722, 523 N.E.2d 190 (1988). These cases are easily distinguished. In both cases the courts relied on the fact that neither the bound nor nonbound prosecutor was aware of the alleged criminal activity that later led to charges. Woods, 169 Ill. App. 3d at 130. In Woods the court declared, “[w]e conclude it would be absurd to hold, without authority, that one county’s State’s Attorney could bind another county’s State’s Attorney without the latter’s knowledge and approval regardless of court approval.” But in Woods the court grounded its decision on an Illinois statute, which sets forth the circumstances under which a plea agreement in one county would bind another county. See former Ill. Rev. Stat. ch. 38, ¶ 1005-4-2(b) (1985) (codified at 6 Ill. Comp. Stat. ch. 730, § 5/5-4-2(b) (West 2000)). Similarly, Barnett relied heavily on the fact each prosecutor’s jurisdiction was limited to acts within the prosecutor’s boundaries, unless a single crime involved a common course of conduct across county lines in which case the prosecutors conceded one prosecutor could bind another. Unlike other states, a prosecutor in Washington has jurisdiction to prosecute a crime committed in another county subject to timely venue objections. State v. Dent, 123 Wn.2d 467, 472, 869 P.2d 392 (1994).
Apparent authority of an agent can be inferred only from the acts and conduct of the principal; the extent of an *104agent’s authority cannot be established by his own acts and declarations. Lamb v. Gen. Assocs., Inc., 60 Wn.2d 623, 627, 374 P.2d 677 (1962); Fletcher v. W. Am. Ins. Co., 59 Wn. App. 553, 558, 799 P.2d 740 (1990); Equico Lessors, Inc. v. Tow, 34 Wn. App. 333, 338, 661 P.2d 597 (1983). The burden of establishing agency rests upon the one who asserts it. Although it may be possible to establish apparent authority on similar facts, Bryant has failed on the record before us to meet his burden. We hold that Bryant has failed to establish the existence of apparent authority.
FUNDAMENTAL FAIRNESS
Constitutional concerns relevant to this case focus on the integrity of the criminal justice system and fundamental fairness. “There is more at stake than just the liberty of this defendant. At stake is the honor of the government [,] public confidence in the fair administration of justice, and the efficient administration of justice in a federal scheme of government.” United States v. Carter, 454 F.2d 426, 428 (4th Cir. 1972). Constitutional concerns flow from the common law principle that confessions are involuntary when procured by promises or threats from a person in authority. Coerced confessions are unconstitutional.
Every agreement by which a witness or accused waives the Fifth Amendment right against self-incrimination in exchange for a promise by the government is subject to fundamental fairness under the due process clauses of the Fifth and Fourteenth Amendments. A grant of informal immunity differs from a plea agreement in that it is never formalized by a guilty plea. An informal immunity agreement does not require court approval. On the contrary, it is a promise by the government to do nothing. Plaster v. United States, 789 F.2d 289, 293 (4th Cir. 1986). Fundamental fairness requires that the government be scrupulously fair when honoring the terms of such proposals. In general, “fundamental fairness and public confidence in government officials require that [the government] be held *105to ‘meticulous standards of both promise and performance.’ ” Palermo v. Warden, 545 F.2d 286, 296 (2d Cir. 1976) (quoting Correale v. United States, 479 F.2d 944, 947 (1st Cir. 1973)). Therefore, the principle of “fundamental fairness” may require that the government perform a promise made by an agent who exceeded his actual authority. Bemis v. United States, 30 F.3d 220, 221 (1st Cir. 1994). “Fundamental fairness” has been applied to informal immunity agreements. United States v. Rodman, 519 F.2d 1058, 1059 (1st Cir. 1975) (dismissing on ground of fairness indictment of defendant based on unfulfilled promise of Securities and Exchange Commission attorney to recommend strongly no prosecution); United States v. Carrillo, 709 F.2d 35, 36 (9th Cir. 1983) (enforcing promise of drug enforcement agency agents that defendant would not be prosecuted if he cooperated in their investigation despite apparent lack of participation of a prosecutor in the promise). While courts applying fundamental fairness have not provided us with a precise test or rule, absent credible evidence that the informant testified untruthfully or otherwise failed to perform, the government must scrupulously perform its end of the bargain.
In this case, there is no allegation of prosecutorial misconduct—nor do we find any. We do find the doctrine of “fundamental fairness,” upon the unique facts of this case, requires dismissal of the Snohomish County charges relating to the Linari case. The pertinent facts are these: both Snohomish County and King County suspected Bryant’s involvement in the Linari case and both counties investigated the string of crimes along the 1-5 corridor. The Linari case was a specific matter under investigation at the time King County entered into the immunity agreement with Bryant. In fact, Bryant was subsequently charged in King County for the Linari offense, which was committed in Snohomish County. Whether or not the string of crimes along 1-5 amounted to a common course of conduct, the King County prosecutor, subject to venue objections, had jurisdiction to prosecute the Snohomish County offense.
*106The King County prosecutor failed to use any language in the immunity agreement that would inform an accused that the immunity was limited to prosecutions within King County. Indeed, broad sweeping statements such as, “nothing you reveal can ever be used against you in any prosecution,” coupled with the Linari case being a specific incident under investigation, could mislead one that the Linari case in Snohomish County was included in the promise of “any prosecution.” Relying on a promise of informal immunity, Bryant incriminated himself and Dorman. Dorman was delivered to Snohomish County as a direct product of Bryant’s incriminating statements; Dorman then incriminated Bryant. Snohomish County asserts there was no sharing of Bryant’s immunized statements. According to Snohomish County, “This non-sharing was deliberate, to avoid tainting any possible subsequent Snohomish County prosecution of the defendant Bryant with Bryant’s own immunized statements.” CP at 24-26, 197, 222. Thus, Snohomish County concedes it believed it could not profit from the fruits of Bryant’s King County admissions. Finally, Snohomish County admits that it cannot prosecute Bryant without Dorman’s testimony. All of the foregoing facts lead us to conclude that “fundamental fairness” and the fair administration of justice require dismissal.6
Accordingly, we remand to the trial court with instructions to dismiss charges against Bryant relating to the Linari case.
Smith, J., concurs.
Israel owned the pawnshop where the stolen goods were allegedly fenced and sold to the public.
The Court of Appeals concluded, “[t]he King County court ruled that Dorman, as an evidentiary source, was derived from Bryant’s immunized statements. Because, as Snohomish County concedes, its case against Bryant could not proceed without Dorman’s testimony, an identical factual issue—whether Dorman’s testimony was derived from Bryant’s immunized statements—was presented in both cases.” State v. Bryant, 100 Wn. App. 232, 237 n.10, 996 P.2d 646 (2000).
The Principles of Federal Prosecution stipulate: “In entering into a non-prosecution agreement, the attorney for the government should, if practicable, explicitly limit the scope of the government’s commitment to: (a) non-prosecution based directly or indirectly on the testimony of other information provided; or (b) *97non-prosecution within his district with respect to a pending charge for a specific offense then known to have been committed by the person.” United States Dep’t of Justice, Principles of Federal Prosecution 41 (1980).
Snohomish County Charter 3.100.
The concurrence concludes that a county prosecutor is an agent of the State. We agree—with some limitation. The grant of authority making a prosecutor an agent of the State is implicitly limited to the prosecutor’s county because of the constitutional solicitude for the independence of the various counties as quasi-independent seats of government. See Wash. Const, art. XI. The State’s limited grant of authority to county prosecutors generally does not permit them to bind executive officers, nor are they explicitly authorized to bind the prosecutors of neighboring counties.
Following oral argument Bryant moved to supplement the record. The document offered was neither timely nor relevant to the opinion and the motion is DENIED.